Le 01/09/2011 13:38, frank_sg a écrit :
Thanks fpr replying.
@Alexandre: Yes, exactly, the 10MB/s (average) come from bacula job report.
At least in my reports the speed shown is the amount of data transferred
divided by the amount of time to complete the job.
For example I had a job which kept waiting for appendable volume during
almost 9 hours.
The backup job itself completed quite quickly as It was almost finished
as soon as a new volume has been made available. However the report told
me the speed was 4kB/s... which is not representative at all, of course.
IIRC the documentation, Spooling allows to write to disk data before it
is written to tape. This allow for better network throuput. Anyhow,
Bacula only consider the job to be completed once all the data has been
written to *tape* (or whatever other final destination).
From the documentation:
/When the backup has only been spooled to disk, it is not complete yet/
In other words you should not trust the bacula reports to measure the
network/disk throuput.
Use something like iostat or iptraf, if that's what you care about.
From the documentation "Of course, if your spool device is not large
enough to hold all the data from your File daemon, you may actually slow
down the overall backup"
But spooling is also usefull when you have concurrent backs, in this
case, i guess you spool dir shoud be at least as large as the sums of
all your concurrent backups.
In really don't think SSD would help here. Any SATA is capable of at
least...; let's say 50MB/s throuput.
@Marcello: No - very time the spool fs is full (or the maximum spool size per
job etc.) is reached the spool fs is despooled to tape. And that is where I
hope to get the advantage from: despooling with full speed to tape. You are
right, the fs has to be fast enough - which SSDs would be obviously. That the
reason for the idea about them. A RAID0 with 12 disks direct attached with SAS
should also be fast enough - but which option is the one to choose?
Regards,
Frank
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